rs587776833

Variant names:

• chr5-180614073-GAGA-G
• rs587776833
• NM_182925.5:c.3323_3325delTCT

Variant summary

Our verdict is Pathogenic. The variant received 11 ACMG points: 11P and 0B. PM2 PM4_Supporting PP5_Very_Strong

The NM_182925.5(FLT4):​c.3323_3325delTCT​(p.Phe1108del) variant causes a disruptive inframe deletion change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000000686 in 1,457,460 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Likely pathogenic (★★).

• Frequency:
  • Genomes: not found (cov: 34)
  • Exomes 𝑓: 6.9e-7 (0 hom.)
• Consequence: FLT4 NM_182925.5 disruptive_inframe_deletion
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:3
• Conservation: PhyloP100: 9.30
• Publications: 3 publications found

Genes affected

FLT4 (HGNC:3767): (fms related receptor tyrosine kinase 4) This gene encodes a tyrosine kinase receptor for vascular endothelial growth factors C and D. The protein is thought to be involved in lymphangiogenesis and maintenance of the lymphatic endothelium. Mutations in this gene cause hereditary lymphedema type IA. [provided by RefSeq, Jul 2008]

FLT4 Gene-Disease associations (from GenCC):

• lymphatic malformation 1

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: ClinGen, Ambry Genetics, Labcorp Genetics (formerly Invitae), G2P
• capillary infantile hemangioma

  Inheritance: AD Classification: STRONG Submitted by: Genomics England PanelApp
• congenital heart defects, multiple types, 7

  Inheritance: AD Classification: STRONG Submitted by: G2P, Labcorp Genetics (formerly Invitae)
• lymphatic malformation

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• tetralogy of fallot

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Pathogenic. The variant received 11 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PM4: Nonframeshift variant in NON repetitive region in NM_182925.5. Strenght limited to Supporting due to length of the change: 1aa.
• PP5: Variant 5-180614073-GAGA-G is Pathogenic according to our data. Variant chr5-180614073-GAGA-G is described in ClinVar as Pathogenic/Likely_pathogenic. ClinVar VariationId is 16268.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
FLT4	NM_182925.5	c.3323_3325delTCT	p.Phe1108del	disruptive_inframe_deletion	Exon 24 of 30	ENST00000261937.11	NP_891555.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
FLT4	ENST00000261937.11	c.3323_3325delTCT	p.Phe1108del	disruptive_inframe_deletion	Exon 24 of 30	1	NM_182925.5	ENSP00000261937.6

Frequencies

GnomAD3 genomes Cov.: 34

GnomAD4 exome AF: 6.86e-7 AC: 1 AN: 1457460 Hom.: 0 AF XY: 0.00000138 AC XY: 1 AN XY: 725344

African (AFR) AF: 0.00 AC: 0 AN: 33384

American (AMR) AF: 0.00 AC: 0 AN: 44720

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26114

East Asian (EAS) AF: 0.00 AC: 0 AN: 39686

South Asian (SAS) AF: 0.00 AC: 0 AN: 86182

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53404

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5756

European-Non Finnish (NFE) AF: 9.03e-7 AC: 1 AN: 1107996

Other (OTH) AF: 0.00 AC: 0 AN: 60218

GnomAD4 genome Cov.: 34

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:3

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Pathogenic:2

Jun 11, 2021

Seattle Children's Hospital Molecular Genetics Laboratory, Seattle Children's Hospital

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant has been previously reported in the scientific literature in association with Milroy disease and primary lymphedemas (PMID: 12960217, PMID: 23074044, PMID: 19002718).

Aug 16, 2024

GeneDx

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Identified in multiple unrelated patients with features of FLT4-related lymphedema previously tested at GeneDx and in published literature, and segregates with disease in affected individuals from several families (PMID: 12960217, 16965327, 19002718, 34681005, 37035731); In-frame deletion of 1 amino acid in a non-repeat region; In silico analysis supports a deleterious effect on protein structure/function; Not observed at significant frequency in large population cohorts (gnomAD); This variant is associated with the following publications: (PMID: 24167460, 12960217, 19002718, 16965327, 10835629, 11114740, 34681005, 37035731)

Hereditary lymphedema type I Pathogenic:1

Sep 01, 2003

OMIM

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: literature only

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
PhyloP100		9.3
Mutation Taster		=21/79	disease causing (ClinVar)

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Other links and lift over

dbSNP: rs587776833; hg19: chr5-180041073;